When I am switching my Mac-book on, it shows "No bootable device -- insert boot device and press any key" what to doe

I was using YouTube in morning and left macbook in sleep mode. Since its battery was dead in evening I connected the power cord and restarted the system. Since then I am facing the error "No bootable device -- insert boot device and press any key".
Please let me know what should be done..

Reboot and hold the alt key. Select the drive you want to boot to. Once successfully booted go to System Preferences>Startup Disk and make sure your system is booting to your Mac partition on startup.

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